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Aluminium is the industry's most widely used non-ferrous structural material and has been widely used in aviation, aerospace, automotive, machinery manufacturing, shipbuilding and chemical industries. With the rapid development of industrial economy, the demand for aluminium alloy welded structure is increasing so that demand for the welding of aluminium also will be increased. Aluminium is currently the most widely used alloys.
Aluminium's density is low, but the intensity is relatively high, close to or more than that of high quality steel or plastic, it can be processed into a variety of profiles, with thermal conductivity and corrosion resistance it is the second most widely used metal in industry after steel . Some aluminium alloy can be heat treated to obtain good mechanical properties, physical properties and corrosion resistance.
Duralumin case of AI-Cu-Mg system, generally contain small amounts of Mn, can be heat strengthened which is characterized by hardness, but poor ductility. Super-hard aluminium cases of Al-Cu-Mg-Zn based, can be heat strengthened to reach the highest strength aluminium alloy at room temperature. But they suffer from poor corrosion resistance, and quickly loses their high temperature and become soft. Wrought alloy is a mainly Al-Zn-Mg-Si based alloy, which has excellent thermoplastic qualities making it suitable for forging, and is often called forged aluminium. However although this adds an element of variety, it lessens content,
Aluminium can be produced to an extremely high-strength alloy and is renown for its excellent performance in use on commercial aircraft, having reached more than 80% of its structural quality, and meets the universal standards of the global aviation industry. Aluminium is used in every day life, consumer products, military affairs, science and technology.
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